Wed August 27, 2003 09:38 AM ET THE HAGUE (Reuters) - An ex-Yugoslav naval officer pleaded guilty at The Hague war crimes tribunal Wednesday to killing civilians by shelling the Croatian city of Dubrovnik in 1991 during Croatia's war of independence against Serbia.

Miodrag Jokic, who had pleaded not guilty to nine counts of violations of the laws and customs of war in 2001, changed his plea to guilty on six counts after the indictment against him was amended by prosecutors at the U.N. court.